1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index ce80b184..e29b2d5d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,4 +1,5 @@
 [tox]
+minversion = 2.4
 envlist = py26,py27,pypy,py33,py34,py35,docs,pep8,py3pep8
 
 [testenv]